So when I got my W124, I replaced most of the ignition items, cap and rotor, spark plugs, ignition coil, fuel filter. I had a fuel smell coming from the side of the car so I replaced the accumulator, and while i was at it, the regulator. I also replaced the six main injectors and seals.

Car runs mostly fine. But at cold start, it takes a bit to crank up (even delays very slightly on warm start). Occasionally when I first hit the throttle after start, the car will hesitate slightly at first, then run fine.

Wondering if the next step are the fuel pumps.

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1986 Porsche 3.2 Carrera - 1987 W124 300E - 1999 Land Cruiser 100 - 2015 MKVII GTI - SLK32 AMG (sold) - 1998 3rd Gen 4Runner Limited (sold)

First, check the duty cycle with a dwell meter at pins 2&3 of the diagnostic port (round cap). Warm engine should show oscillation of the reading bracketing 45 degrees (50%).

Good advice, thank you. My Fluke doesn't show percent, but it supposedly does measure duty cycle. It was giving me a reading between 5.7 to 6.3 volts, which based on what I'm reading is between 57% and 63%? Not sure if that's accurate, but that's what I'm seeing. Does that mean it's running lean at idle?

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1986 Porsche 3.2 Carrera - 1987 W124 300E - 1999 Land Cruiser 100 - 2015 MKVII GTI - SLK32 AMG (sold) - 1998 3rd Gen 4Runner Limited (sold)

If, in fact the voltages do translate to percentages (10V = 100%), then yes, the mixture is lean. The described starting and acceleration faults are consistent with a lean condition. Are you familiar with the main/basic mixture adjustment screw located in the "tower" between the air flow meter and the fuel distributor? If so, proceed to richen in 1/8 turn CW increments.

That's really what I'm trying to chase down. I actually don't know if the voltage converts to % readings.

Second question though, who says the lean condition is just a function of the setting, couldn't it also be a vac leak somewhere?

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1986 Porsche 3.2 Carrera - 1987 W124 300E - 1999 Land Cruiser 100 - 2015 MKVII GTI - SLK32 AMG (sold) - 1998 3rd Gen 4Runner Limited (sold)

I'm just going to go get a TRMS multimeter.

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1986 Porsche 3.2 Carrera - 1987 W124 300E - 1999 Land Cruiser 100 - 2015 MKVII GTI - SLK32 AMG (sold) - 1998 3rd Gen 4Runner Limited (sold)

Ok. New multimeter says 100% duty cycle with the red lead in 3 and the black lead in 2. So. Bad ovp or bad o2 sensor?

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1986 Porsche 3.2 Carrera - 1987 W124 300E - 1999 Land Cruiser 100 - 2015 MKVII GTI - SLK32 AMG (sold) - 1998 3rd Gen 4Runner Limited (sold)